And they have a tendency to grow there where nature reads, …

And they have a tendency to grow there where nature reads, in the fields of mamals, that we need their medicinal effect. So if they start growing around your house, you know what time it is. And once you see that the bugs don't stay on the flowers anymore, when each time they come sit on them it's only for 1 or 2 seconds, then you know that all their pollen has been taken, and that you can take the blossom now as well, without taking abything from the bugs. Till then you can just take some of its leaves. Both make a good tea, but only the flower itself makes a tasty tea. But more effect for your body is if you cut the green leaves into your salad.
AND IF you would be curing cancer, then that's the time to dig out the roots of the plant, of which you can also make tea. I tried it for my big doggy Sheebee, and it shrunk her terrible open wound-looking cancer away in a little over a month. But just because you can't see it anymore, doesn't mean that it's all gone. I would recommend to make the tea daily for a longer time. With that I also gave her only organic food; rice with boiled carrots, broccoli and chicken, with the broth of both.